from django.shortcuts import render

from rest_framework.views import APIView
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from rest_framework import status

from alipay import AliPay
from payment.models import Payment
from django.conf import settings
import os

from orders.models import OrderInfo


class PaymentView(APIView):
    """支付"""
    permission_classes = [IsAuthenticated]

    def get(self, request, order_id):
        """获取支付链接"""
        # 判断订单信息是否正确
        try:
            order = OrderInfo.objects.get(
                order_id=order_id,
                user=request.user,
                pay_method=OrderInfo.PAY_METHODS_ENUM['ALIPAY'],
                status=OrderInfo.ORDER_STATUS_ENUM['UNPAID']
            )
        except OrderInfo.DoesNotExist:
            return Response({'message': '订单信息有误'}, status=status.HTTP_400_BAD_REQUEST)

        # 构造支付宝支付链接地址
        alipay = AliPay(
            appid=settings.ALIPAY_APPID,
            app_notify_url=None,  # 默认回调url
            app_private_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'keys/app_private_key.pem'),
            alipay_public_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'keys/alipay_public_key.pem'),
            sign_type='RSA2',  # RSA 或者　RSA2
            debug=settings.ALIPAY_DEBUG  # 默认False
        )

        order_string = alipay.api_alipay_trade_page_pay(
            out_trade_no=order_id,
            total_amount=str(order.total_amount),
            subject='美多商城%s' % order_id,
            return_url='http://www.meiduo.site:8080/pay_success.html',
        )

        # 需要跳转到https://openapi.alipay.com/gateway.do? + order_string
        # 拼接链接返回前端
        alipay_url = settings.ALIPAY_URL + '?' + order_string
        return Response({'alipay_url': alipay_url})


class PaymentStatusView(APIView):
    """支付结果"""
    def put(self, request):
        data = request.query_params.dict()
        signature = data.pop('sign')

        alipay = AliPay(
            appid=settings.ALIPAY_APPID,
            app_notify_url=None,  # 默认回调url
            app_private_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)), 'keys/app_private_key.pem'),
            alipay_public_key_path=os.path.join(os.path.dirname(os.path.abspath(__file__)),'keys/alipay_public_key.pem'),
            sign_type="RSA2",  # RSA 或者 RSA2
            debug=settings.ALIPAY_DEBUG  # 默认False
        )

        success = alipay.verify(data, signature)
        if success:
            # 订单编号
            order_id = data.get('out_trade_no')
            # 支付宝支付流水号
            trade_id = data.get('trade_no')
            Payment.objects.creat(
                order_id=order_id,
                trade_id=trade_id
            )
            OrderInfo.objects.filter(
                order_id=order_id,
                status=OrderInfo.ORDER_STATUS_ENUM['UNPAID']
            )
            return Response({'trade_id': trade_id})
        else:
            return Response({'message': '非法请求'}, status=status.HTTP_403_FORBIDDEN)













